USB: musb_host: undo incorrect change in musb_advance_schedule()

Commit c9cd06b3d6ea825c62e277def929cc4315802b48 (musb_host: refactor
URB giveback) included due to my overlook the change incorrect in the
context of the current kernel -- undo it.

Signed-off-by: Sergei Shtylyov <[e-mail]>
Acked-by: David Brownell <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/musb/musb_host.c

···
 		musb_save_toggle(qh, is_in, urb);
 		break;
 	case USB_ENDPOINT_XFER_ISOC:
-		if (urb->error_count)
+		if (status == 0 && urb->error_count)
 			status = -EXDEV;
 		break;
 	}